Show ELECTRIC LIGHTS IN MINING vau au of the arc am lp L p in pit sinking at aft rat rm r at t depth A novel a application of the electric searchlight light har t aa been made in in scotland t to i 0 c en alc the wor man to labor la bor i IA r ht while a pit i is hc be arcu ch I 1 light ht the apparatus appa ritu ratu lor for chih 1 I i cau aisted of an are arc lamp lens and a mirror J in in a abati alke iron iron case was bus suspended over 01 er the pitt mouth access to the lamp was a obtained by a sliding shutter on cai ca tide i de of t e case cac the light s CIL t n ht t louis Globe democrat was fo boiu iu Q or adjusted b by a screw on tile top 0 of the outside of the case cae ca e and when i hen nee abary the lamp could be adjusted t diffuse I 1 light i throughout t the lie whole holi shaft or be concentrated at the bot torn tom the mirror mirror which was AL on its center could be moved in in a vertical direction so to deflect the rays ra Ys of light to any any required spot t and could be fixed i in any position by a thumb screw this method of illumination was found to give the following advantages the light in in the shaft bottom was far in in excess of that given by the ordinary sin sinkers liers lamp consequently more inor work could be performed perform d in in a given time the lamp being stationed stationed on the surface could be got at easily at any time for adjustment t without in ir i convenience to the sinkers and in in the event of the strata giving oil off firedamp fire damp it gave perfect imbur ty from danger of explosion another point of not a little importance was that by the aid of the light those in charge could see sc from the surface what was going on below and a practical mining cn engineer who visited the colliery gave as his opinion that this alone was worth all the outlay even if the light served no other purpose |